Injection nozzle



y 28, 1959 v. M. JEMISON ET AL 2,896,864

INJECTION NOZZLE Filed May 19, 1958 INVEN TOR. Voz/vfr/i JfM/iOAAwflON/Zyou/v6.

' 3 MM SM AT T ORNEX United States Patent INJECTION NOZZLE Volney M.Jemison and Don H. Young, Phoenix, 'Ariz., assignors to ThunderbirdEngineering Company, Phoenix, Ariz., a corporation of ArizonaApplication May '19, 1958, Serial No. 736,194

2 Claims. (Cl. 239-451) This invention pertains to injection nozzles andis particularly directed to injection nozzles for use with solventinjecting devices and the like.

One of the objects of this invention is to provide an injection nozzlefor dispensing a liquid in a finely broken up state to facilitate mixingwith the receiving solution into which the liquid is to be injected.

Still another object of this invention is to provide an injection nozzlewhich atomizes a liquid to be injected into a solution so as to effect ahighly efficient mixing with the solution.

It is also an object of this invention to provide an injection nozzleparticularly adapted to injecting a solvent or wetting agent into theregular rinse water flow line of a dishwashing machine.

Further features and advantages of this invention will appear from adetailed description of the drawings in which:

Fig. 1 is an enlarged fragmentary sectional view of an injection nozzleincorporating the features of this invention, showing the nozzle inclosed, non-flow position.

Fig. 2 is an enlarged fragmentary view showing the nozzle of Fig. 1, butin opening injecting position.

Fig. 3 is an enlarged perspective of the coil spring element of theinjection nozzle.

As examplar of one embodiment of this invention there is shown aninjection nozzle comprising the fitting having the usual pipe thread 11for securing the injection nozzle unit into a fitting of a pipe line(not shown). The fitting 10 has the supply passageway 12 in which istightly fitted the plug 13 having a passageway 14 communicating with thesupply passageway 12 of the fitting 10. A diametrically disposed lateralpassageway 15 is formed in the plug 13 and is in communication with thepassageway 14 and opens outwardly at the ports 16 and 17 on the outsidediameter portion 18 of the plug 13. The ports '16 and 17 are locatedbetween the conical surface 19 formed on the fitting 10 and the conicalsurface 20 formed on the head 21 of the plug 13.

A specially constructed coil spring 22 having normally 2,896,864Patented July 28, 1959 tightly wound coils in contact at 23 is formedwith conical surfaces 24 sloping inwardly at each end of the spring,these surfaces 24 engaging the mating conical surfaces 19 and 20 inliquid tight sealing relationship at all times. When no fluid pressureis being applied through the passageway 14 and ports 16 and 17, thespring assumes the position shown in Fig. 1 with the sides of the coilsin tight closed contact as at 23. As pressure is applied through theports 16 and 17, the spring is caused to expand under pressure in thearea 25, the spring unwinding and elongating while its conical surfaces24 slide outwardly on the conical surfaces 19 and 20. The coils thusseparate as at 26 allowing the liquid to escape through these finehelical slots formed thereby and providing the desired atomizing actionin the liquid discharged through the spring 22. Since the coil spring 22can adjust itself on the tapered surfaces 19 and 20 for variations influid supply from the passage- Way 14, proper atomizing and mixing canbe obtained over wide variations in liquid flow to thus provide allaround high efiiciency. Also the device is self-cleaning as increasedpressure due to material accumulating between the coils causes thespring to further expand and thus free the clogging material.

While the apparatus herein disclosed and described constitutes apreferred fonn of the invention, it is also to be understood that theapparatus is capable of mechanical alteration without departing from thespirit of the invention and that such mechanical arrangement andcommercial adaptation as fall within the scope of the appendant claimsare intended to be included herein.

Having thus fully set forth and described this invention what is claimedand desired to be obtained by United States Letters Patent is:

1. An injection nozzle comprising a fitting member having a pair ofspaced facing conical surfaces, a tightly coiled coil spring havingfemale conical surfaces on its end portions engaging said conicalsurfaces of said fitting forming a pressure chamber inside of saidspring and between said conical surfaces of said fitting, and conduitmeans in said fittings in communication with said pressure chamber tosupply fluid pressure in said pressure chamber to expand said spring sothat the conical surfaces on the ends of said spring move outwardly ofthe conical surfaces of said fitting.

2. In an injection nozzle as set forth in claim 1 wherein said conicalsurfaces of said fitting and said coil spring remain in fluid tightcontact for any expanded or retracted condition of said coil spring.

Melas June 29, 1915 Schlagintweit June 6, 1939

